package com.heima.admin.gateway.filter;


import com.heima.admin.gateway.utils.AdminJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @Author: JW
 * @Description: TODO
 * @DateTime: 2022/1/21 23:08
 **/
@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {


    String[] exclusive = {"/login"};

    /**
     * @Author: JW
     * @Description:  TODO 拦截请求
     * @Date: 23:09 2022/1/21
     * @Param: [exchange, chain]
     * @return: reactor.core.publisher.Mono<java.lang.Void>
    **/
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登录
        if(request.getURI().getPath().contains("/login")){
            //放行
            return chain.filter(exchange);
        }

        //3.获取token
        String token = request.getHeaders().getFirst("token");

        //4.判断token是否存在
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //5.判断token是否有效
        Claims claimsBody = AdminJwtUtil.getClaimsBody(token);

        try {
            //是否是过期
            int result = AdminJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        //获得token解析后中的用户信息
        Integer userId = (Integer) claimsBody.get("id");
        //增加请求头信息
        ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
            httpHeaders.add("userId", userId + "");
        }).build();
        exchange.mutate().request(serverHttpRequest).build();

        //6.放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
